1 /*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "gm.h"
9 #include "SkGradientShader.h"
10 #include "SkPath.h"
11
12 namespace skiagm {
13
14 class FillTypePerspGM : public GM {
15 SkPath fPath;
16 public:
FillTypePerspGM()17 FillTypePerspGM() {}
18
makePath()19 void makePath() {
20 if (fPath.isEmpty()) {
21 const SkScalar radius = SkIntToScalar(45);
22 fPath.addCircle(SkIntToScalar(50), SkIntToScalar(50), radius);
23 fPath.addCircle(SkIntToScalar(100), SkIntToScalar(100), radius);
24 }
25 }
26
27 protected:
28
onShortName()29 SkString onShortName() override {
30 return SkString("filltypespersp");
31 }
32
onISize()33 SkISize onISize() override {
34 return SkISize::Make(835, 840);
35 }
36
showPath(SkCanvas * canvas,int x,int y,SkPath::FillType ft,SkScalar scale,const SkPaint & paint)37 void showPath(SkCanvas* canvas, int x, int y, SkPath::FillType ft,
38 SkScalar scale, const SkPaint& paint) {
39 const SkRect r = { 0, 0, SkIntToScalar(150), SkIntToScalar(150) };
40
41 canvas->save();
42 canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
43 canvas->clipRect(r);
44 canvas->drawColor(SK_ColorWHITE);
45 fPath.setFillType(ft);
46 canvas->translate(r.centerX(), r.centerY());
47 canvas->scale(scale, scale);
48 canvas->translate(-r.centerX(), -r.centerY());
49 canvas->drawPath(fPath, paint);
50 canvas->restore();
51 }
52
showFour(SkCanvas * canvas,SkScalar scale,bool aa)53 void showFour(SkCanvas* canvas, SkScalar scale, bool aa) {
54 SkPaint paint;
55 SkPoint center = SkPoint::Make(SkIntToScalar(100), SkIntToScalar(100));
56 SkColor colors[] = {SK_ColorBLUE, SK_ColorRED, SK_ColorGREEN};
57 SkScalar pos[] = {0, SK_ScalarHalf, SK_Scalar1};
58 SkShader* s = SkGradientShader::CreateRadial(center,
59 SkIntToScalar(100),
60 colors,
61 pos,
62 SK_ARRAY_COUNT(colors),
63 SkShader::kClamp_TileMode);
64 paint.setShader(s)->unref();
65 paint.setAntiAlias(aa);
66
67 showPath(canvas, 0, 0, SkPath::kWinding_FillType,
68 scale, paint);
69 showPath(canvas, 200, 0, SkPath::kEvenOdd_FillType,
70 scale, paint);
71 showPath(canvas, 00, 200, SkPath::kInverseWinding_FillType,
72 scale, paint);
73 showPath(canvas, 200, 200, SkPath::kInverseEvenOdd_FillType,
74 scale, paint);
75 }
76
onDraw(SkCanvas * canvas)77 void onDraw(SkCanvas* canvas) override {
78 this->makePath();
79
80 // do perspective drawPaint as the background;
81 SkPaint bkgnrd;
82 SkPoint center = SkPoint::Make(SkIntToScalar(100),
83 SkIntToScalar(100));
84 SkColor colors[] = {SK_ColorBLACK, SK_ColorCYAN,
85 SK_ColorYELLOW, SK_ColorWHITE};
86 SkScalar pos[] = {0, SK_ScalarHalf / 2,
87 3 * SK_ScalarHalf / 2, SK_Scalar1};
88 SkShader* s = SkGradientShader::CreateRadial(center,
89 SkIntToScalar(1000),
90 colors,
91 pos,
92 SK_ARRAY_COUNT(colors),
93 SkShader::kClamp_TileMode);
94 bkgnrd.setShader(s)->unref();
95 canvas->save();
96 canvas->translate(SkIntToScalar(100), SkIntToScalar(100));
97 SkMatrix mat;
98 mat.reset();
99 mat.setPerspY(SK_Scalar1 / 1000);
100 canvas->concat(mat);
101 canvas->drawPaint(bkgnrd);
102 canvas->restore();
103
104 // draw the paths in perspective
105 SkMatrix persp;
106 persp.reset();
107 persp.setPerspX(-SK_Scalar1 / 1800);
108 persp.setPerspY(SK_Scalar1 / 500);
109 canvas->concat(persp);
110
111 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
112 const SkScalar scale = SkIntToScalar(5)/4;
113
114 showFour(canvas, SK_Scalar1, false);
115 canvas->translate(SkIntToScalar(450), 0);
116 showFour(canvas, scale, false);
117
118 canvas->translate(SkIntToScalar(-450), SkIntToScalar(450));
119 showFour(canvas, SK_Scalar1, true);
120 canvas->translate(SkIntToScalar(450), 0);
121 showFour(canvas, scale, true);
122 }
123
124 private:
125 typedef GM INHERITED;
126 };
127
128 //////////////////////////////////////////////////////////////////////////////
129
MyFactory(void *)130 static GM* MyFactory(void*) { return new FillTypePerspGM; }
131 static GMRegistry reg(MyFactory);
132
133 }
134